forked from luck/tmp_suning_uos_patched
0a0f0d8be7
Split out all the bits that are purely for dma_map_ops implementations and related code into a new <linux/dma-map-ops.h> header so that they don't get pulled into all the drivers. That also means the architecture specific <asm/dma-mapping.h> is not pulled in by <linux/dma-mapping.h> any more, which leads to a missing includes that were pulled in by the x86 or arm versions in a few not overly portable drivers. Signed-off-by: Christoph Hellwig <hch@lst.de>
39 lines
940 B
C
39 lines
940 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Dummy DMA ops that always fail.
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*/
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#include <linux/dma-map-ops.h>
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static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size,
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unsigned long attrs)
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{
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return -ENXIO;
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}
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static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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return DMA_MAPPING_ERROR;
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}
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static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir,
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unsigned long attrs)
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{
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return 0;
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}
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static int dma_dummy_supported(struct device *hwdev, u64 mask)
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{
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return 0;
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}
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const struct dma_map_ops dma_dummy_ops = {
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.mmap = dma_dummy_mmap,
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.map_page = dma_dummy_map_page,
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.map_sg = dma_dummy_map_sg,
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.dma_supported = dma_dummy_supported,
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};
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